Yesterday I finally made a leap and bought my first DSLR - Canon 7d. I also bought Canon 17-55 f2.8 lens. However, i feel like 17-55 is too short for my taste.

I would like to do a lot of family portaits and take candid shots of my little ones (very busy). What would you recommend for indoor and outdoor use? budget $1,500.
I am considering 85 f1.8, 50 f1.4, 100 f2.8 or 24-70 f2.8.